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D-NE500/NE506CK
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electro-
static breakdown because of the potential difference generated by
the charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
Precautions for Checking Emission of Laser Diode
Laser light of the equipment is focused by the object lens in the
optical pick-up so that the light focuses on the reflection surface
of the disc. Therefore, be sure to keep your eyes more then 30 cm
apart from the object lens when you check the emission of laser
diode.
Before Replacing the Optical Pick-Up Block
Please be sure to check throughly the parameters as par the "Opti-
cal Pick-Up Block Checking Procedures" (Part No.: 9-960-027-
11) issued separately before replacing the optical pick-up block.
Note and specifications required to check are given below.
• FOK output : IC601 yg pin (or TP624 (FOK))
When checking FOK, remove the lead wire to disc motor.
• RF signal P-to-P value : 0.45 ± 0.1 Vp-p
• The repairing grating holder is impossible.
Laser Diode Checking Methods
During normal operation of the equipment, emission of the laser
diode is prohibited unless the upper lid is closed while turning ON
the S803. (push switch type)
The following two checking methods for the laser diode are
operable.
• Method:
Emission of the laser diode is visually checked.
1. Open the upper lid.
2. With a disc not set, turn on the S803 with a screwdriver having a
thin tip.
Note: Do not push the detection lever strongly, or it may be bent
or damaged.
3. Press the N X button.
4. Observing the objective lens, check that the laser diode emits
light.
When the laser diode does not emit light, automatic power
control circuit or optical pick-up is faulty.
In this operation, the objective lens will move up and down 5
times along with inward motion for the focus search.
4
SECTION 1
SERVICE NOTE
– MAIN BOARD (SIDE B) –
120
1
30
31
R641
TP648 TP646
R631
– MAIN BOARD (SIDE A) –
J301
i
– MAIN BOARD (SIDE B) –
R842
CN802
TP831
TP842
TP833
TP835
TP806
TP846
26
R611
R610
R606
R618
C616
C615
C614
91
C604
90
R620
IC601
C608
C603
R608
61
60
C623
FB606
IC601 65 pin
D305
D101
D306
FB101
J301
FB303
FB201
TP624
TP823
VDR804
24
TP822
TP824
TP827
TP829
TP825
R834 R832
SL806
25
R605
R616
C613
TP610
TP701
C610
TP629
TP302
TP625
TP301
TP102
X601
TP628
TP624
VDR602 VDR609
C617
S803
S803
S803
(OPEN/CLOSE)
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